Use constexpr TaskTraits constructor in base (part 2).

base/task_scheduler/post_task.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TASK_SCHEDULER_POST_TASK_H_
 #define BASE_TASK_SCHEDULER_POST_TASK_H_
 
 #include <utility>
 
 #include "base/base_export.h"
@@ skipping 12 matching lines @@
 namespace base {
 
 // This is the preferred interface to post tasks to the TaskScheduler.
 //
 // To post a simple one-off task with default traits:
 //     PostTask(FROM_HERE, Bind(...));
 //
 // To post a high priority one-off task to respond to a user interaction:
 //     PostTaskWithTraits(
 //         FROM_HERE,
-//         TaskTraits().WithPriority(TaskPriority::USER_BLOCKING),
+//         {TaskPriority::USER_BLOCKING},
 //         Bind(...));
 //
 // To post tasks that must run in sequence with default traits:
 //     scoped_refptr<SequencedTaskRunner> task_runner =
 //         CreateSequencedTaskRunnerWithTraits(TaskTraits());
 //     task_runner.PostTask(FROM_HERE, Bind(...));
 //     task_runner.PostTask(FROM_HERE, Bind(...));
 //
 // To post tasks that may block, must run in sequence and can be skipped on
 // shutdown:
 //     scoped_refptr<SequencedTaskRunner> task_runner =
 //         CreateSequencedTaskRunnerWithTraits(
-//             TaskTraits().MayBlock().WithShutdownBehavior(
-//                 TaskShutdownBehavior::SKIP_ON_SHUTDOWN));
+//             {MayBlock(), TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
 //     task_runner.PostTask(FROM_HERE, Bind(...));
 //     task_runner.PostTask(FROM_HERE, Bind(...));
 //
 // The default traits apply to tasks that:
 //     (1) don't block (ref. MayBlock() and WithBaseSyncPrimitives()),
 //     (2) prefer inheriting the current priority to specifying their own, and
 //     (3) can either block shutdown or be skipped on shutdown
 //         (TaskScheduler implementation is free to choose a fitting default).
 // Explicit traits must be specified for tasks for which these loose
 // requirements are not sufficient.
@@ skipping 154 matching lines @@
 // implementation is free to share apartments or create new apartments as
 // necessary. In either case, care should be taken to make sure COM pointers are
 // not smuggled across apartments.
 BASE_EXPORT scoped_refptr<SingleThreadTaskRunner>
 CreateCOMSTATaskRunnerWithTraits(const TaskTraits& traits);
 #endif  // defined(OS_WIN)
 
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_POST_TASK_H_